Surface study of InP nanocrystals synthesized using aminophosphine

Youngsik Kim^a, Mahnmin Choi^a, Ju Young Woo^b, Hyekyoung Choi^a, Sohee Jeong^a

^aSungkyunkwan University, Department of Energy Science, South Korea, Suwon, Gyeonggi, Corea del Sur, Suwon, Korea, Republic of

^bKorea Institute of Industrial Technology, Micro/Nano Scale Manufacturing Group, South Korea, 143 Hanggaulro, Sangrok-gu, Ansan-si, Gyeonggi-do, Korea, Republic of

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting19 (NFM19)

#NCFun19. Fundamental Processes in Semiconductor Nanocrystals

Berlin, Germany, 2019 November 3rd - 8th

Organizers: Ivan Infante and Jonathan Owen

Poster, Youngsik Kim, 408
Publication date: 18th July 2019

Quantum dots (QDs), that are semiconducting nanocrystals with quantum confinement effect, have a very large surface area to volume ratio, so their various properties of QDs can be controlled by adjusting their surface landscape. Therefore, research on the surface of QDs has been actively carried out, but unfortunately, research on the surface of InP QD is relatively lagging behind compared to other QD materials (e.g., PbS¹, PbSe²). One of the reasons why the surface understanding of InP QDs is lacking is the difficulty to imagine the surface of InP QDs because their surface is composed of too many facets. In this study, we compare facet dependent surface chemistry of InP QDs prepared using aminophosphine as a phosphorus precursor^3-⁵ thus having well-defined surfaces which are composed of only {111} or {110} with {111} facets. These well-defined surface provide more clear information about the surface analysis. Through surface characterization via nuclear magnetic resonance (NMR) spectroscopy, x-ray emission spectroscopy (XPS), thermal gravity analysis (TGA), we study the facet dependent properties such as the surface ligand density, atomic compositions, and their optoelectronic properties.

References:

[1] Choi, H.; Ko, J. H.; Kim, Y. H.; Jeong, S. Steric-Hindrance-Driven Shape Transition in PbS Quantum Dots: Understanding Size-Dependent Stability. J. Am. Chem. Soc. 2013, 135 (14), 5278–5281.

[2] Woo, J. Y.; Ko, J. H.; Song, J. H.; Kim, K.; Choi, H.; Kim, Y. H.; Lee, D. C.; Jeong, S. Ultrastable PbSe Nanocrystal Quantum Dots via in Situ Formation of Atomically Thin Halide Adlayers on PbSe(100). J. Am. Chem. Soc. 2014, 136 (25), 8883–8886.

[3] Song, W.-S.; Lee, H.-S.; Lee, J. C.; Jang, D. S.; Choi, Y.; Choi, M.; Yang, H. Amine-Derived Synthetic Approach to Color-Tunable InP/ZnS Quantum Dots with High Fluorescent Qualities. J. Nanoparticle Res. 2013, 15 (6), 1750.

[4] Tessier, M. D.; Dupont, D.; De Nolf, K.; De Roo, J.; Hens, Z. Economic and Size-Tunable Synthesis of InP/ZnE (E = S, Se) Colloidal Quantum Dots. Chem. Mater. 2015, 27 (13), 4893–4898.

[5] Kim, K.; Yoo, D.; Choi, H.; Tamang, S.; Ko, J.; Kim, S.; Kim, Y.; Jeong, S. Halide–Amine Co-Passivated Indium Phosphide Colloidal Quantum Dots in Tetrahedral Shape. Angew. Chem. 2016, 55, 1–6.

Acknowledgements:

This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT(NRF-2019M3D1A1078296), the NRF grant funded by the MSIT (NRF-2019R1A2B5B03070407), and the grant (20173010013200) funded by KETEP and MOTIE, the Global Frontier R&D program of the Center for Multiscale Energy Systems ( NRF-2017M3A6A7051087)

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